I read that it is possible to get it on the 7th day of field research.

Are there other known ways to acquire this crucial item?

  • Just got one from a friend's gift the other day. There are articles & likely a wiki entry somewhere about this, IIRC. – l3l_aze Jan 16 at 6:09
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    All the Stack Exchange communities would not exist if it all came down to "There is a wiki somewhere". As for Pokemon Go, there are 1000 site with click bait titles and false information in order to monetize their site for 1 site with good information. So people turn to ARQADE because it is centralized and trustworthy. – Kevin Gagnon Jan 23 at 16:26
  • Dropping this here: On Feb 16 2019 you will have 5 guaranteed Sinnoh Stones. twitter.com/NianticHelp/status/1088160614176804864 – Kevin Gagnon Jan 23 at 21:06
  • Yes, but you also made no mention of any effort to find this yourself, which is another thing that fills up the Stack Exchange sites with simple questions like this -- lack of trying to find something before asking. Edit: eurogamer.net was the first result for me. – l3l_aze Jan 26 at 15:28
  • eurogamer.net is far from official information. That's also if you get passed the ads and the useless blocks of text. – Kevin Gagnon Jan 27 at 21:22

As of January 2019, Sinnoh Stones can be received from 7 day field research rewards as well as trainer battles (one chance a day for Blanche/Candela/Spark, three chances a day against an actual person). Actually doing the battle is what is necessary - whether you win or lose doesn't matter.

Drops are not guaranteed and there may be new methods for obtaining Sinnoh Stones added at any given time - many of which may be temporary. Unfortunately, posting the actual drop rates here wouldn't be very helpful as the actual drop rates are changing without notice as drops are shifted around by Niantic.

You can expect the methods for obtaining the Sinnoh Stone to change over time.

  • Do you have a source on "whether you win or lose doesn't matter." – Kevin Gagnon Jan 23 at 16:38
  • @KevinGagnon Last time I battled against my cousin. He lost and got a Sinnoh Stone, I won and didn't get one. So yeah, it doesn't really matter. – Paul Karam Jan 29 at 7:04

it is possible to gain them from trainer battle rewards (I do not know if this requires you to win against another player).

If I am not mistaken, you can also get them from spinning a stop for seven days straight, but I am not certain.

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